--- hatari/src/includes/sound.h	2019/04/09 08:49:32	1.1.1.11
+++ hatari/src/includes/sound.h	2019/04/09 08:53:13	1.1.1.13
@@ -1,8 +1,8 @@
 /*
   Hatari - sound.h
 
-  This file is distributed under the GNU Public License, version 2 or at
-  your option any later version. Read the file gpl.txt for details.
+  This file is distributed under the GNU General Public License, version 2
+  or at your option any later version. Read the file gpl.txt for details.
   
   Matthias Arndt 2008-08-15
     - cleanup to have definitions and declarations for both sound cores in one place
@@ -43,6 +43,7 @@ typedef		yms16			ymsample;	/* Output sam
 
 #define YM_LINEAR_MIXING		1		/* Use ymout1c5bit[] to build ymout5[] */
 #define YM_TABLE_MIXING			2		/* Use volumetable_original to build ymout5[] */
+#define YM_MODEL_MIXING			3		/* Use circuit analysis model to build ymout5[] */
 
 extern int	YmVolumeMixing;
 extern bool	UseLowPassFilter;
@@ -58,6 +59,8 @@ extern bool Sound_BeginRecording(char *p
 extern void Sound_EndRecording(void);
 extern bool Sound_AreWeRecording(void);
 extern void Sound_SetYmVolumeMixing(void);
+extern ymsample Subsonic_IIR_HPF_Left(ymsample x0);
+extern ymsample Subsonic_IIR_HPF_Right(ymsample x0);
 
 
 #endif  /* HATARI_SOUND_H */